I am not exactly sure if you only need to trigger the search by the enter key, or if you need it the other way around.
You can change the trigger option under the General Options -> Logic & Behavior panel, those might be what you are looking for: https://i.imgur.com/XgyEtJf.png
Hello Ernest, I want to get the search results by pressing the Enter button of my search and by pressing the Return key of my keyboard (I don’t want live search).
Oh okay, I get it now. The enter key does not affect the custom field input fields, only the main input field, that is the problem there. In this case only the search button will work.